Illustrated Glossary of Organic Chemistry

β-Sheet (beta-sheet; beta-pleated sheet): A secondary structure motif of peptides and proteins, characterized by two or more amino acid strands connected laterally by two or more hydrogen bonds between a peptide bond N-H in one strand and a peptide bond C=O in the adjacent strand. The resultant structure has a twisted, 'pleated sheet' topography.

Representations of a Protein β-sheet